when I run roslaunch mavros px4.launch command process start and shut down.
> ... logging to /home/yograj/.ros/log/77663396-f411-11e7-b93c-3c77e68de09b/roslaunch-yograj-Inspiron-5537-12518.log
Checking log directory for disk usage. This may take awhile.
Press Ctrl-C to interrupt
Done checking log file disk usage. Usage is <1GB.
>
> started roslaunch server http://yograj-Inspiron-5537:40223/
>
> SUMMARY
>
> ========
>
> CLEAR PARAMETERS
>
> * /mavros/
> PARAMETERS
>
> * /mavros/cmd/use_comp_id_system_control: False
> * /mavros/conn/heartbeat_rate: 1.0
> * /mavros/conn/system_time_rate: 1.0
> * /mavros/conn/timeout: 10.0
> * /mavros/conn/timesync_rate: 10.0
> * /mavros/distance_sensor/hrlv_ez4_pub/field_of_view: 0.0
> * /mavros/distance_sensor/hrlv_ez4_pub/frame_id: hrlv_ez4_sonar
> * /mavros/distance_sensor/hrlv_ez4_pub/id: 0
> * /mavros/distance_sensor/hrlv_ez4_pub/orientation: ROLL_180
> * /mavros/distance_sensor/hrlv_ez4_pub/send_tf: True
> * /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/x: 0.0
> * /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/y: 0.0
> * /mavros/distance_sensor/hrlv_ez4_pub/sensor_position/z: -0.1
> * /mavros/distance_sensor/laser_1_sub/id: 3
> * /mavros/distance_sensor/laser_1_sub/orientation: ROLL_180
> * /mavros/distance_sensor/laser_1_sub/subscriber: True
> * /mavros/distance_sensor/lidarlite_pub/field_of_view: 0.0
> * /mavros/distance_sensor/lidarlite_pub/frame_id: lidarlite_laser
> * /mavros/distance_sensor/lidarlite_pub/id: 1
> * /mavros/distance_sensor/lidarlite_pub/orientation: ROLL_180
> * /mavros/distance_sensor/lidarlite_pub/send_tf: True
> * /mavros/distance_sensor/lidarlite_pub/sensor_position/x: 0.0
> * /mavros/distance_sensor/lidarlite_pub/sensor_position/y: 0.0
> * /mavros/distance_sensor/lidarlite_pub/sensor_position/z: -0.1
> * /mavros/distance_sensor/sonar_1_sub/id: 2
> * /mavros/distance_sensor/sonar_1_sub/orientation: ROLL_180
> * /mavros/distance_sensor/sonar_1_sub/subscriber: True
> * /mavros/fake_gps/eph: 2.0
> * /mavros/fake_gps/epv: 2.0
> * /mavros/fake_gps/fix_type: 3
> * /mavros/fake_gps/geo_origin/alt: 408.0
> * /mavros/fake_gps/geo_origin/lat: 47.3667
> * /mavros/fake_gps/geo_origin/lon: 8.55
> * /mavros/fake_gps/gps_rate: 5.0
> * /mavros/fake_gps/mocap_transform: True
> * /mavros/fake_gps/satellites_visible: 5
> * /mavros/fake_gps/tf/child_frame_id: fix
> * /mavros/fake_gps/tf/frame_id: map
> * /mavros/fake_gps/tf/listen: False
> * /mavros/fake_gps/tf/rate_limit: 10.0
> * /mavros/fake_gps/tf/send: False
> * /mavros/fake_gps/use_mocap: True
> * /mavros/fake_gps/use_vision: False
> * /mavros/fcu_url: udp://:14540@127....
> * /mavros/gcs_url:
> * /mavros/global_position/child_frame_id: base_link
> * /mavros/global_position/frame_id: map
> * /mavros/global_position/rot_covariance: 99999.0
> * /mavros/global_position/tf/child_frame_id: base_link
> * /mavros/global_position/tf/frame_id: map
> * /mavros/global_position/tf/global_frame_id: earth
> * /mavros/global_position/tf/send: False
> * /mavros/global_position/use_relative_alt: True
> * /mavros/image/frame_id: px4flow
> * /mavros/imu/angular_velocity_stdev: 0.000349065850399
> * /mavros/imu/frame_id: base_link
> * /mavros/imu/linear_acceleration_stdev: 0.0003
> * /mavros/imu/magnetic_stdev: 0.0
> * /mavros/imu/orientation_stdev: 1.0
> * /mavros/local_position/frame_id: map
> * /mavros/local_position/tf/child_frame_id: base_link
> * /mavros/local_position/tf/frame_id: map
> * /mavros/local_position/tf/send: False
> * /mavros/local_position/tf/send_fcu: False
> * /mavros/mission/pull_after_gcs: True
> * /mavros/mocap/use_pose: True
> * /mavros/mocap/use_tf: False
> * /mavros/odometry/estimator_type: 3
> * /mavros/odometry/frame_tf/desired_frame: ned
> * /mavros/plugin_blacklist: ['safety_area', '...
> * /mavros/plugin_whitelist: []
> * /mavros/px4flow/frame_id: px4flow
> * /mavros/px4flow/ranger_fov: 0.118682389136
> * /mavros/px4flow/ranger_max_range: 5.0
> * /mavros/px4flow/ranger_min_range: 0.3
> * /mavros/safety_area/p1/x: 1.0
> * /mavros/safety_area/p1/y: 1.0
> * /mavros/safety_area/p1/z: 1.0
> * /mavros/safety_area/p2/x: -1.0
> * /mavros/safety_area/p2/y: -1.0
> * /mavros/safety_area/p2/z: -1.0
> * /mavros/setpoint_accel/send_force: False
> * /mavros/setpoint_attitude/reverse_thrust: False
> * /mavros/setpoint_attitude/tf/child_frame_id: target_attitude
> * /mavros/setpoint_attitude/tf/frame_id: map
> * /mavros/setpoint_attitude/tf/listen: False
> * /mavros/setpoint_attitude/tf/rate_limit: 50.0
> * /mavros/setpoint_attitude/use_quaternion: False
> * /mavros/setpoint_position/mav_frame: LOCAL_NED
> * /mavros/setpoint_position/tf/child_frame_id: target_position
> * /mavros/setpoint_position/tf/frame_id: map
> * /mavros/setpoint_position/tf/listen: False
> * /mavros/setpoint_position/tf/rate_limit: 50.0
> * /mavros/setpoint_velocity/mav_frame: LOCAL_NED
> * /mavros/startup_px4_usb_quirk: True
> * /mavros/sys/disable_diag: False
> * /mavros/sys/min_voltage: 10.0
> * /mavros/target_component_id: 1
> * /mavros/target_system_id: 1
> * /mavros/tdr_radio/low_rssi: 40
> * /mavros/time/time_ref_source: fcu
> * /mavros/time/timesync_avg_alpha: 0.6
> * /mavros/time/timesync_mode: MAVLINK
> * /mavros/vibration/frame_id: base_link
> * /mavros/vision_pose/tf/child_frame_id: vision_estimate
> * /mavros/vision_pose/tf/frame_id: map
> * /mavros/vision_pose/tf/listen: False
> * /mavros/vision_pose/tf/rate_limit: 10.0
> * /mavros/vision_speed/listen_twist: False
> * /rosdistro: kinetic
> * /rosversion: 1.12.12
>
> NODES
> /
> mavros (mavros/mavros_node)
>
> ROS_MASTER_URI=http://localhost:11311
>
> process[mavros-1]: started with pid [12536]
> [FATAL] [1515375213.809935923]: UAS: GeographicLib exception: File not readable /usr/share/GeographicLib/geoids/egm96-5.pgm | Run install_geographiclib_dataset.sh script in order to install Geoid Model dataset!
>
> ================================================================================
>
> REQUIRED process [mavros-1] has died!
> process has finished cleanly
> log file: /home/yograj/.ros/log/77663396-f411-11e7-b93c-3c77e68de09b/mavros-1*.log
> Initiating shutdown!
>
> ================================================================================
>
> [mavros-1] killing on exit
> shutting down processing monitor...
> ... shutting down processing monitor complete
> done